The North and South were arguing over slavery. The South wanted slaves but the North didn't.
It would be the "Midway Atoll" that is is south of the Hawaiian Islands in the Pacific Ocean, and this was the location of one of the most pivotal battles between the US and Japan in World War II.
Fort Union was established to protect the cimarron route of the Santa Fe trail due to incessant attacks from the Indians. The Indians used to attack the American travelers who passed through that route.
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